Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81963ff54065a64…

MALICIOUS

PDF

77.0 KB Created: 2021-03-15 01:31:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d63ee7ee4f997212475bd036e7283413 SHA-1: 27f9f776a15982d778a823d5908ae629805f9145 SHA-256: b81963ff54065a644b0b75f58315f939ccac7a769506cf43b729f45143c1314d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one specifically pointing to 'fokemale.ru', a domain flagged as a link farm on disposable hosting. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/wix?keyword=naming+ionic+compounds+with+transition+metals+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379605/normal_601b52f4d3633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419205/normal_602a5621c17b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481695/normal_604630f241145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481068/normal_6018cf69230c0.pdfIn PDF document text
    • http://pudirexuzil.iblogger.org/rifatupemasogipofog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453747/normal_60029bb170105.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481509/normal_600398aec9c28.pdfIn PDF document text
    • http://sikutamilom.iblogger.org/53335808128.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vozovowu.rf.gd/60439440049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2926f97-373e-4184-8f41-980698fd73e7/fovafusigizekefar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b329e56f-6624-4f9c-a87b-294c3176aa98/39437335432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ad9004-5b0d-46de-8972-1490b4ce55a2/losing_it_book_by_valerie_bertinelli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5427b789-5187-4a93-8c06-6cc3989267f5/vafomarit.pdfIn PDF document text
    • http://deroluzotuz.epizy.com/ginefibodozowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d409cb3-802d-40a8-b4f3-2d73ee735970/what_color_to_wear_for_second_wedding.pdfIn PDF document text
    • http://pegebikevoki.epizy.com/cahier_journal_cp.pdfIn PDF document text
    • http://tazigedefabe.rf.gd/what_names_start_with_jen.pdfIn PDF document text
    • http://repibikapowa.epizy.com/jegobomobilam.pdfIn PDF document text
    • http://folujas.epizy.com/baby_name_bournvita_video_song.pdfIn PDF document text
    • http://xizokokov.epizy.com/java_version_for_epfo_digital_signature.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 5612 bytes
SHA-256: 8e97d94c4ff53f4fce6163d5e0a3d0f2e6522df6c01b5486fbbcfce85d98e5a8
font_01_sfnt_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 10388 bytes
SHA-256: 926ffbe1f12474881cd8c73561995fdcfef4c85bed3e8516c54088bc1cd42930

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